In a flash analog-to-digital converter, the output of each comparator is connect

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Question
In a flash analog-to-digital converter, the output of each comparator is connected to an input of a ________.
Options
A. decoder
B. priority encoder
C. multiplexer
D. demultiplexer

Correct Answer

priority encoder

Digital Signal Processing problems

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1. Settling time is normally defined as the time it takes a DAC to settle within ________.
Options
A. 1/8 LSB of its final value when a change occurs in the input code
B. 1/4 LSB of its final value when a change occurs in the input code
C. 1/2 LSB of its final value when a change occurs in the input code
D. 1 LSB of its final value when a change occurs in the input code

2. Which of the following best defines Nyquist frequency?
Options
A. The frequency of resonance for the filtering circuit
B. The second harmonic
C. The lower frequency limit of sampling
D. The highest frequency component of a given analog signal

3. In a digital reproduction of an analog curve, accuracy can be increased by ________.
Options
A. sampling the curve more often
B. sampling the curve less often
C. decreasing the number of bits used to represent each sampled value
D. all of the above

5. A binary-weighted-input digital-to-analog converter has a feedback resistor, R_f, of 12 kΩ. If 50 µA of current is through the resistor, voltage out of the circuit is ________.
Options
A. 0.6 V
B. ?0.6 V
C. 0.1 V
D. ?0.1 V

8. In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________.
Options
A. 5 volts
B. zero volts
C. a voltage determined by the binary weighted input
D. none of the above

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